Stowage, segregation, IMDG, ballast water, dangerous goods, lashing, deadweight planning.
56 terms in this category.
- 'Tween Deck
An intermediate deck between the upper and lower decks of a cargo hold, providing separate stowage tiers for break-bulk cargo.
- Angle of Loll
The angle at which a vessel with negative initial stability comes to rest on her side as she cannot return to upright.
- BAPLIE
An EDI message format conveying the stowage positions of all containers aboard a vessel between terminals and ship operators.
- Bay Plan
A grid diagram showing every container slot in a vessel's cross-section by bay, row, and tier with container data.
- Boil-Off Gas (BOG)
Vapour generated naturally as cryogenic cargo (LNG, LPG, ethylene, ammonia) absorbs heat through tank insulation and boils.
- Boil-Off Rate (BOR)
Daily fraction of cryogenic cargo lost to boil-off, expressed as % of cargo mass per day.
- Break Bulk
Non-containerised cargo loaded individually as bags, bales, crates, or drums rather than in standard containers.
- Broken Stowage
The wasted space in a cargo hold that cannot be utilised due to the shape or packaging of the cargo being carried.
- Cool-Down
Gradual cooling of LNG/LPG cargo tanks with cargo vapour before loading to prevent thermal shock to membrane / pressure vessel walls.
- Crude Oil Washing (COW)
Cleaning crude oil tanks with their own cargo as the wash medium, replacing earlier seawater-flush methods.
- Custody Transfer (CT)
Measurement and transfer of cargo from seller to buyer in a contractually-binding way, conducted by a third-party surveyor.
- Dangerous Goods (DG)
Cargo classified under the IMDG Code as posing risks to health, safety, property, or the environment during sea transport.
- Deadweight (DWT)
The total weight a vessel can carry including cargo, fuel, water, stores, and crew, measured in metric tonnes.
- Deck Cargo
Cargo stowed on the open weather deck and exposed to the sea environment, requiring additional securing and weatherproofing.
- Displacement
The total mass of water displaced by a floating vessel, equal to the combined weight of the hull, machinery, cargo, and stores.
- Dunnage
Timber, mats, or other material placed under or between cargo to protect it from moisture, damage, and shifting.
- Emergency Shutdown (ESD)
Automated/manual system that stops cargo transfer in seconds when a high-level alarm, leak, or other unsafe condition is detected.
- Forty-foot Equivalent Unit (FEU)
Standard unit of cargo capacity equivalent to one 40-foot ISO shipping container, equal to two TEU.
- Free Surface Effect (FSE)
The virtual reduction in GM caused by a liquid surface in a partially filled tank that moves as the ship heels, reducing stability.
- Gassing Up
Replacing inert gas in LNG/LPG cargo tanks with cargo vapour before cool-down, eliminating CO2 and water that would freeze at cryogenic temperatures.
- IMDG Class 1 (Explosives)
IMDG dangerous-goods classification for explosive substances and articles.
- IMDG Class 2 — Gases
Compressed, liquefied, or dissolved gases; subdivided 2.1 flammable, 2.2 non-flammable non-toxic, 2.3 toxic.
- IMDG Class 3 — Flammable Liquids
Liquids with flash point ≤ 60 °C; classified by packing group I/II/III based on flash point and boiling point.
- IMDG Class 4
Flammable solids (4.1), substances liable to spontaneous combustion (4.2), substances which emit flammable gases when wet (4.3).
- IMDG Class 5
Oxidising substances (5.1) and organic peroxides (5.2); pose fire risk by yielding oxygen.
- IMDG Class 6
Toxic substances (6.1) and infectious substances (6.2).
- IMDG Class 7 (Radioactive)
IMDG dangerous-goods classification for radioactive material.
- IMDG Class 8 — Corrosives
Substances causing severe damage when in contact with living tissue or other goods, including most acids and bases.
- IMDG Class 9 (Miscellaneous Dangerous Goods)
Catch-all for substances dangerous in transport but not fitting Classes 1-8 (e.g., asbestos, dry ice, lithium batteries, env. hazardous).
- International Maritime Dangerous Goods Code (IMDG)
IMO code governing the safe carriage of hazardous materials by sea, covering classification, packing, marking, and stowage.
- International Safety Guide for Oil Tankers and Terminals (ISGOTT)
Industry standard guidance jointly published by OCIMF, ICS, and IAPH for oil-tanker / terminal cargo operations.
- Lashing
Chains, wire, or webbing straps used to secure cargo on deck or in holds against movement during sea passage.
- Lashing Rod
A threaded steel rod used in combination with turnbuckles to secure containers and deck cargo against movement at sea.
- Light Ship
A vessel's weight when fully equipped with permanent fixtures but without cargo, fuel, ballast, stores, or crew on board.
- Load on Top (LOT)
Pre-COW practice of letting tank washings settle, decanting the water, and loading new cargo on top of the oil residue.
- Marine Pollutant (MP)
Substance identified in IMDG Code as harmful to the marine environment; carries the 'Marine Pollutant' (dead-fish-and-tree) mark.
- Material Safety Data Sheet (MSDS)
A document providing information on the hazards, handling precautions, and emergency procedures for a chemical or dangerous cargo.
- Metacentric Height (GM)
The vertical distance between the centre of gravity (G) and the metacentre (M), the primary indicator of a vessel's initial stability.
- Moment to Change Trim 1 cm (MCT1cm)
The trimming moment in tonne-metres needed to alter a vessel's trim by one centimetre, used in stability calculations.
- Purging (cargo tank)
Replacing one gas atmosphere in a cargo tank with another (typically replacing flammable hydrocarbon with inert gas before tank entry, or vice versa before loading).
- Reefer
A refrigerated container or cargo space maintaining a controlled temperature for perishable goods during transport.
- Reefer Plug
An electrical socket in a ship's hold or on deck providing power to a reefer container's refrigeration unit.
- Roll-On/Roll-Off (RoRo)
Cargo handling method where wheeled vehicles or trailers drive on and off the vessel under their own power via ramps.
- Segregation
The physical separation of incompatible dangerous goods in stowage to prevent hazardous reactions if packaging fails.
- Ship/Shore Link (SSL)
Hardwired signalling cable between ship and terminal for ESD and safety status during cargo transfer.
- Ship/Shore Safety Checklist (SSSCL)
Mandatory pre-cargo-transfer checklist verified jointly by ship and terminal representatives.
- Stowage Factor (SF)
The volume in cubic metres or cubic feet that one metric tonne of a commodity occupies when stowed in a ship's hold.
- Stowage Plan
A diagram showing the planned or actual position of all cargo units aboard a vessel for a given voyage.
- Summer Draft
The maximum permissible draft when loading in a Summer load line zone, shown on the ship's side as the Summer load line mark.
- Tonnes Per Centimetre (TPC)
The mass required to change a vessel's mean draft by one centimetre, used to calculate draft changes during loading or discharging.
- Trim by the Head
A trim condition where the forward draft exceeds the aft draft, reducing steering effectiveness and increasing wave-making resistance.
- Trim by the Stern
A trim condition where the aft draft exceeds the forward draft, generally preferred for sea passage to improve propulsive efficiency.
- Turnbuckle
A threaded tensioning device fitted in a lashing rod or wire to adjust and tighten cargo securing arrangements.
- Twenty-foot Equivalent Unit (TEU)
Standard unit of cargo capacity equivalent to one 20-foot ISO shipping container, used to measure container ship capacity.
- Twistlock
A securing device that fits into container corner castings and locks by a 90° twist to stack and secure containers.
- Vapour Recovery System (VRS)
Closed-loop return of cargo vapour from ship to shore (or shore to ship) during loading to prevent atmospheric venting.